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Trigonometry
hard
0:00.0
If
cos
(
A
)
=
1
/
3
\cos(A) = 1/3
cos
(
A
)
=
1/3
, find
cos
(
3
A
)
\cos(3A)
cos
(
3
A
)
.
A
-23/27
B
-21/27
C
-25/27
D
-19/27
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